Add GET /api/v1/jobs

[wslulciuc]

This PR adds the endpoint GET /api/v1/jobs, no longer requiring a namespace. You can still list jobs for a given namesake via GET /api/v1/namespaces/{namespace}/jobs

[netlify]

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Name	Link
🔨 Latest commit	0042457
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[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.13%. Comparing base (90a2f65) to head (0042457).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
api/src/main/java/marquez/api/JobResource.java	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2930      +/-   ##
============================================
+ Coverage     81.02%   81.13%   +0.10%     
- Complexity      241     1507    +1266     
============================================
  Files            43      268     +225     
  Lines           996     7367    +6371     
  Branches         40      330     +290     
============================================
+ Hits            807     5977    +5170     
- Misses          160     1229    +1069     
- Partials         29      161     +132     

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